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38 ANOMALOUS AS-ENRICHMENT in GERSDORFFITE in a REALGAR-RICH ENVIRONMENT: LOJANE, MACEDONIA Or Evi , T.1, Kolitsch, U.2,1, Tasev

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38 ANOMALOUS AS-ENRICHMENT in GERSDORFFITE in a REALGAR-RICH ENVIRONMENT: LOJANE, MACEDONIA Or Evi , T.1, Kolitsch, U.2,1, Tasev MITT.ÖSTERR.MINER.GES. 163 (2017) ANOMALOUS AS-ENRICHMENT IN GERSDORFFITE IN A REALGAR-RICH ENVIRONMENT: LOJANE, MACEDONIA or evi , T.1, Kolitsch, U.2,1, Tasev, G.3, Serafimovski, T.3 & Boev, B.3 1Institut für Mineralogie und Kristallographie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria 2Mineralogisch-Petrographische Abteilung, Naturhistorisches Museum, Burgring 7, A-1010 Wien, Austria 3Department of Mineral Deposits, Faculty of Natural Sciences, University “Goce Del ev”-Štip, Goce Del ev 89, 2000 Štip, FYR Macedonia [email protected] The abandoned Sb−As−Cr mine near Lojane (HIESSLEITNER, 1951; GRAFENAUER, 1977) in northeast Macedonia is a substantial source of arsenic and antimony pollution. The mine and flotation dumps present one of the major environmental problems for Macedonia and are considered a very serious human health risk given high concentration of arsenic-rich wastes (ALDERTON et al., 2014 and references therein). During a detailed mineralogical study of realgar-stibnite and chromite ore assemblages and their secondary alteration products (collected on ore and waste dumps) by SEM-EDS, EPMA, Raman spectroscopy, single-crystal and powder XRD, we detected a larger number of phases not previously recorded for the deposit (e.g. annabergite, arsenic (or arsenolamprite), baryte, chalcopyrite, coffinite, duranusite, galena, gersdorffite, gypsum, hydroxylapatite, laurite, maucherite(?), millerite, naldrettite(?), parkerite(?), pentlandite, picropharmacolite, pyrrhotite, roméite-group minerals, scorodite, senarmontite, siderite, sphalerite, ullmannite, valentinite, violarite and an unidentified Bi-As-S-Cl-(O?) phase), as well as partly amorphous, small- grained arsenates of Ca, Fe, Sb, Ni etc., including probable arseniosiderite. Grains of chromite-group species are scattered throughout the As-Sb mineralisation. Nearly all of the observed sulphides contain trace to minor amounts of As, reflecting the As- rich environment. Rounded, commonly finely zoned (concentric or patchy) gersdorffite aggregates up to 20 µm occur in realgar, stibnite and quartz. They often show an anomalous composition with strong As-enrichment and S-depletion and a clear negative correlation between As and S. Only minor Co and Fe contents were measured. Patchy small areas in some aggregates are strongly enriched in Sb, representing As-rich ullmannite. The previously unrecognised occurrence of several Ni(-As) minerals (apart from already reported Ni-bearing pyrite and vaesite, both also observed in our studies), adds another, albeit small, toxic component to the environmental pollution. We acknowledge the financial support of the Federal Ministry of Science, Research and Economy, Program Scientific & Technological Cooperation between Macedonia and Austria 2016-2018 (MK 05/2016). ALDERTON, D., SERAFIMOVSKI, T., BURNS, L., TASEV, G. (2014): Carpath. J. Earth Environ. Sci., 9, 43- 56. GRAFENAUER, S. (1977): Genesis of chromite in Yugoslavian peridotite. pp. 327-351 in KLEMM, D.D., SCHNEIDER, H.-J. (eds.): Time- and Strata-Bound Ore Deposits. Springer. HIESSLEITNER, G. (1951): Jb. Geol. B.-A., Sonderband 1, 1-255. 38.
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